PHP的error_reporting错误级别变量对照表

在php中所有的报错信息可以用error_reporting()这个函数来设置：

它的参数有字符串和数字两种表示方法，共14个等级，但是呢，我看使用其他数字貌似也可以，起初我以为它指的是一定的报错区间，后来，终于发现了其中的规律：

error_reporting( 7 ) = error_reporting( 1+2+4)= error_reporting(e_error | e_waring | e_parse)

现在，我将其总结如下：

数字	常量	说明
1	e_error	致命错误，脚本执行中断，就是脚本中有不可识别的东西出现 举例： error：invalid parameters. invalid parameter name
2	e_warning	部分代码出错，但不影响整体运行 举例： warning: require_once(e:/include/config_base.php)
4	e_parse	字符、变量或结束的地方写规范有误 举例：  parse error: syntax error, unexpected $end in
8	e_notice	一般通知，如变量未定义等 举例：  notice: undefined variable: p in e:\web\index.php on line 17
16	e_core_error	php进程在启动时，发生了致命性错误 举例：  暂无
32	e_core_warning	在php启动时警告(非致命性错误) 举例：  暂无
64	e_compile_error	编译时致命性错误 举例：  暂无
128	e_compile_warning	编译时警告级错误 举例：  暂无
256	e_user_error	用户自定义的错误消息 举例：  暂无
512	e_user_warning	用户自定义的警告消息 举例：  暂无
1024	e_user_notice	用户自定义的提醒消息 举例：  暂无
2047	e_all	以上所有的报错信息，但不包括e_strict的报错信息 举例：  暂无
2048	e_strict	编码标准化警告，允许php建议如何修改代码以确保最佳的互操作性向前兼容性。

error_reporting 变量的默认值是  e_all & ~e_notice
开发时，最佳的值为： e_all | e_strict

如果设置为：error_reporting(e_all | e_strict)，则表示记录所有的错误信息
可能会导致网站出现一大堆的错误代码；但是对于程序员来说应该说是一件好事，可以把代码优化到最优； 一些非致命性错误虽然不影响程序的运行，但是会加重php的负担.

最后，晒出英文版的对照表：

1	e_error	fatal run-time errors. errors that can not be recovered from. execution of the script is halted
2	e_warning	non-fatal run-time errors. execution of the script is not halted
4	e_parse	compile-time parse errors. parse errors should only be generated by the parser
8	e_notice	run-time notices. the script found something that might be an error, but could also happen when running a script normally
16	e_core_error	fatal errors at php startup. this is like an e_error in the php core
32	e_core_warning	non-fatal errors at php startup. this is like an e_warning in the php core
64	e_compile_error	fatal compile-time errors. this is like an e_error generated by the zend scripting engine
128	e_compile_warning	non-fatal compile-time errors. this is like an e_warning generated by the zend scripting engine
256	e_user_error	fatal user-generated error. this is like an e_error set by the programmer using the php function trigger_error()
512	e_user_warning	non-fatal user-generated warning. this is like an e_warning set by the programmer using the php function trigger_error()
1024	e_user_notice	user-generated notice. this is like an e_notice set by the programmer using the php function trigger_error()
2048	e_strict	run-time notices. php suggest changes to your code to help interoperability and compatibility of the code
4096	e_recoverable_error	catchable fatal error. this is like an e_error but can be caught by a user defined handle (see also set_error_handler())
8191	e_all	all errors and warnings, except level e_strict (e_strict will be part of e_all as of php 6.0)